First choice in the drop-down menu is blank

Question

First choice in the drop-down menu is blank

I am relatively new to working with AngularJS and currently I am developing a web application in Django where I am utilizing AngularJS for the frontend. The issue I am facing is that the dropdown list, populated with objects from a scope, always starts with a blank element. This causes problems because if the user does not select anything, the POST request may fail to work. I am looking for a way to have a preselected value or something similar. Here is a snippet of my code:

Select tag:

<select id="sel" class="input-block-level" ng-model="list_category">
            <option ng-repeat="obj in list_categories.data" value="{{obj.id}}">{{obj.name}}</option>
            <option value="Other">Other</option>
        </select>

$scope.list_categories:

var listcategoryPromise = ListCategory.get();
    listcategoryPromise.then(function(response) {
        $scope.list_categories = {
            meta : response.data.meta,
            data : response.data.objects
        };
    });

javascript angularjs

Answer 1

Answer №1

To implement the functionality, utilize the ng-options directive and exclude the value attribute from the 'Other' selection as shown below:

<select id="sel" class="input-block-level" ng-model="list_category" ng-options="obj.id as obj.name for obj in list_categories.data">    
    <option value="">Other</option>
</select>

By following this approach, when list_category is uninitialized (no option chosen), the 'Other' choice will be automatically selected.

Code Example on jsFiddle: http://jsfiddle.net/username/example/

Answer 2

To implement the functionality, utilize the ng-options directive and exclude the value attribute from the 'Other' selection as shown below:

<select id="sel" class="input-block-level" ng-model="list_category" ng-options="obj.id as obj.name for obj in list_categories.data">    
    <option value="">Other</option>
</select>

By following this approach, when list_category is uninitialized (no option chosen), the 'Other' choice will be automatically selected.

Code Example on jsFiddle: http://jsfiddle.net/username/example/

Answer 3

Answer №2

Check out the working example below demonstrating why it's best to avoid using ng-repeat with options. Take a look at the sample code provided:

<body ng-controller="testcontroller">
         <select ng-model="item" ng-options="item.ID as item.Title for item in items">
         </select>
            <span>{{item}}</span>
    </body>

App.controller('testcontroller', function ($scope) {
    $scope.item = '000001';
    $scope.items = [
      { ID: '000001', Title: 'Chicago' },
      { ID: '000002', Title: 'New York' },
      { ID: '000003', Title: 'Washington' }
    ];
});

Answer 4

Check out the working example below demonstrating why it's best to avoid using ng-repeat with options. Take a look at the sample code provided:

<body ng-controller="testcontroller">
         <select ng-model="item" ng-options="item.ID as item.Title for item in items">
         </select>
            <span>{{item}}</span>
    </body>

App.controller('testcontroller', function ($scope) {
    $scope.item = '000001';
    $scope.items = [
      { ID: '000001', Title: 'Chicago' },
      { ID: '000002', Title: 'New York' },
      { ID: '000003', Title: 'Washington' }
    ];
});

Answer 5

Answer №3

You can customize the syntax for <select> elements when using Angularjs.

This method is influenced by the instructions found on the official documentation page:

<select id="sel" class="input-block-level" ng-model="list_category" ng-options="obj.name for obj in list_categories.data">
    <option value="Other">Other</option>
</select>

Answer 6

You can customize the syntax for <select> elements when using Angularjs.

This method is influenced by the instructions found on the official documentation page:

<select id="sel" class="input-block-level" ng-model="list_category" ng-options="obj.name for obj in list_categories.data">
    <option value="Other">Other</option>
</select>

Answer 7

Answer №4

Check out this code snippet from the AngularJs.org website regarding select lists:

<select ng-model="color" ng-options="c.name for c in colors"></select>

One thing to note is that you don't need to use ng-repeat to populate your options list. Angular allows you to loop through a collection and generate your options dynamically. Also, the ng-model on the select tag does not have to match the name of your collection. It serves as the item that will be captured when the form is submitted.

function MyCntrl($scope) {
   $scope.colors = [
      {name:'black', shade:'dark'},
      {name:'white', shade:'light'},
      {name:'red', shade:'dark'},
      {name:'blue', shade:'dark'},
      {name:'yellow', shade:'light'}
  ];
  $scope.color = $scope.colors[2]; // red
}

The JavaScript controller code above demonstrates how the collection ($scope.colors) and model property ($scope.color) are linked. The model property is initially set to the third option in the array. This default value can be obtained from an initial http.get call when loading your page.

When looping through the collection, you're essentially displaying the 'name' value in the dropdown and using it for submission. By setting an initial model property value, you can prevent having an empty option in your drop-down list.

For more information, visit: AngularJS Select

Answer 8

Check out this code snippet from the AngularJs.org website regarding select lists:

<select ng-model="color" ng-options="c.name for c in colors"></select>

One thing to note is that you don't need to use ng-repeat to populate your options list. Angular allows you to loop through a collection and generate your options dynamically. Also, the ng-model on the select tag does not have to match the name of your collection. It serves as the item that will be captured when the form is submitted.

function MyCntrl($scope) {
   $scope.colors = [
      {name:'black', shade:'dark'},
      {name:'white', shade:'light'},
      {name:'red', shade:'dark'},
      {name:'blue', shade:'dark'},
      {name:'yellow', shade:'light'}
  ];
  $scope.color = $scope.colors[2]; // red
}

The JavaScript controller code above demonstrates how the collection ($scope.colors) and model property ($scope.color) are linked. The model property is initially set to the third option in the array. This default value can be obtained from an initial http.get call when loading your page.

When looping through the collection, you're essentially displaying the 'name' value in the dropdown and using it for submission. By setting an initial model property value, you can prevent having an empty option in your drop-down list.

For more information, visit: AngularJS Select

Answer 9

Answer №5

Based on my perspective, this particular response appears to be more organized:

$scope.form = {type : $scope.typeOptions[0].value};

This jsfiddle link might provide more insight.

Answer 10

Based on my perspective, this particular response appears to be more organized:

$scope.form = {type : $scope.typeOptions[0].value};

This jsfiddle link might provide more insight.

Answer 11

Answer №6

If you find a blank empty option at the top of a drop-down menu, it may be due to the ng-model being set to a value that is not included in the list of options generated by the ng-Repeat. To fix this, either remove the ng-model or ensure that it has a valid value. Alternatively, you can set the first item in the list as selected by using the following code:

$scope.list_category = $scope.list_categories.data[0].id;

Answer 12

If you find a blank empty option at the top of a drop-down menu, it may be due to the ng-model being set to a value that is not included in the list of options generated by the ng-Repeat. To fix this, either remove the ng-model or ensure that it has a valid value. Alternatively, you can set the first item in the list as selected by using the following code:

$scope.list_category = $scope.list_categories.data[0].id;

First choice in the drop-down menu is blank

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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